Their removable end caps incorporate anti-slip wall pads, which allow the level to be held firmly against a wall with one hand without slipping.
Each level has 2 vertical vials and 1 horizontal vial.
The levels have 2 milled measuring surfaces
Measurement Accuracy: in normal position 0.029° = 0.5 mm/m, overhead measurement 0.029° = 0.5 mm/m.